Healthy circadian rhythms rely on regularity and stability— for the timing of light, the timing of exercise, and the timing of meals.

Our bodies are accustomed to the exposure of light and darkness on a regular basis. The circadian rhythm is reset on a daily basis and it i...

Our sun is part of a massive collection of stars in the Milky Way galaxy. These hundreds of billions of stars orbit the galaxy’s center. But did you know that there are things that are even bigger orbiting the Milky Way’s center? Other galaxies orbit it too!

These less mass...

UV light comes from the sun and is transmitted in waves or particles at different wavelengths an frequencies.

It makes black-light posters glow, and is responsible for summer tans. But too much exposure to UV radiation damage living tissue.